Dental adhesives

Abstract

A formulation for use as a dental adhesive in the treatment of the hard tooth substance, to provide enhanced bonding between dental restoration material and the enamel and dentine of the tooth. The formulation contains glycerol di(meth)acrylate, volatile solvent, photo-initiator and, optionally, usual additives and fillers.

What is claimed is: 
     
       1. A formulation for use as an adhesive component in the repair of a hard substance of a tooth, said formulation comprising a) 20-75% by weight of glycerol di(meth)acrylate,   b) 20-75% by weight of a volatile solvent miscible with water,   c) 0.01-2.5% by weight of a photo-initiator, and   d) 0-40% by weight of dental additives and fillers.   
     
     
       2. A formulation according to claim 1, wherein the glycerol di(meth)acrylate is an isomeric mixture of 1,2-glycerol di(meth)acrylate and 1,3-glycerol di(meth)acrylate; and   the volatile solvent is a C 1  -C 4  aliphatic alcohol, acetone, 1,4 dioxane or tetrahydrofuran.   
     
     
       3. Dental adhesive comprising the formulation according to claim 1. 
     
     
       4. A formulation according to claim 1, wherein said dental additives comprise polyethylene glycol di(meth)acrylates having a molecular weight of 200-2,000. 
     
     
       5. A formulation according to claim 1 consisting of a) 20-75% by weight of glycerol di(meth)acrylate,   b) 20-75% by weight of a volatile solvent miscible with water,   c) 0.01-2.5% by weight of a photo-initiator, and   d) 0-40% by weight of polyethylene glycol di(methyl)acrylates having a molecular weight of 200-2,000.   
     
     
       6. A formulation for use as an adhesive component in the repair of the hard substance of a tooth, said formulation comprising a) 20-70% by weight of glycerol di(meth)acrylate,   b) 20-70% by weight of a volatile solvent miscible with water,   c) 0.01-2.5% by weight of a photo-initiator,   d1) 5-20% by weight of a filler and,   d2) 0-25% by weight of dental additives.   
     
     
       7. A formulation according to claim 6, wherein said filler is highly dispersed silica with a mean particle size of 5-2000 nm. 
     
     
       8. A formulation according to claim 7, wherein the mean particle size of the highly dispersed silica is 10-100 nm. 
     
     
       9. A formulation according to claim 6, wherein the glycerol di(meth)acrylate is an isomeric mixture of 1,2-glycerol di(meth)acrylate and 1,3-glycerol di(meth)acrylate; and   the volatile solvent is a C 1  -C 4  aliphatic alcohol, acetone, 1,4 dioxane or tetrahydrofuran.   
     
     
       10. A formulation according to claim 9, wherein said filler is highly dispersed silica with a mean particle size of 5-2000 nm. 
     
     
       11. A formulation according to claim 10, wherein the mean particle size of the highly dispersed silica is 10-100 nm. 
     
     
       12. Dental adhesive comprising the formulation according to claim 6. 
     
     
       13. A formulation according to claim 6, wherein said dental additives comprise polyethylene glycol di(meth)acrylates having a molecular weight of 200-2,000. 
     
     
       14. A formulation according to claim 6 consisting of a) 20-70% by weight of glycerol di(meth)acrylate,   b) 20-70% by weight of a volatile solvent miscible with water,   c) 0.01-2.5% by weight of a photo-initiator,   d1) 5-20% by weight of a filler and   d2) 0-25% by weight of polyethylene glycol di(methyl)acrylates having a molecular weight of 200-2,000.